Sweet pea(Lathyrus latifolia) Perennial. Zones 5-9. This perennial sweet pea does not have the sweet pea scent. The trade off is that it is perennial and you can enjoy it year after year once you get it started. I've seen it come in many shades of pink and it can grow in the most abysmal soil...that which is in road cuts. I often see it growing happily on road banks. It doesn't do well in dry years without supplemental water. It can be trained to grow up strings or trellis. Sweet peas are vines and they can either ramble or climb. It needs full sun, but I've seen it growing ok in part sun.
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